THEORETICAL ANALYSIS ON THE NUCLEATION OF MICRO-DAMAGE IN CEMENT MORTAR UNDER COMPRESSIVE LOADING AND SULFATE ATTACK  

作　　者：Jiankang Chen Hui Song Minghua Zhang Jian Ye 

机构地区：[1]The Faculty of Mechanical Engineering and Mechanics,Ningbo University [2]State Key Laboratory of Turbulence and Complex Systems [3]Jiangsu Provincial Water Resources Department

出　　处：《Acta Mechanica Solida Sinica》2013年第1期53-61,共9页固体力学学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Nos. 10932001,51079069,10972109,and 10802039);the National Basic Research Program of China (973 Program,No. 2009CB623203);the Ministry of Education of the People’s Republic of China (No. 20103305110001);K.C.Wong Magna Fund in Ningbo University

摘　　要：Effect of uniaxial compression on the nucleation of micro-damage in cement mortar under sulfate attack is investigated. Shape and size of micro-voids in cement mortar is detected using Micro Computed Tomography techniques. The formation of delayed ettringite crystal is analyzed using scanning electron microscope and energy disperse spectrum methods. Deformation of micro-voids and the distribution of stress at the surface of a micro-void are calculated. It is found that the nucleation of micro-cracks is caused by the tensile stress at the voids＇ surface, and such damage nucleation will be speeded up by the remote uniaxial compressive load.Effect of uniaxial compression on the nucleation of micro-damage in cement mortar under sulfate attack is investigated. Shape and size of micro-voids in cement mortar is detected using Micro Computed Tomography techniques. The formation of delayed ettringite crystal is analyzed using scanning electron microscope and energy disperse spectrum methods. Deformation of micro-voids and the distribution of stress at the surface of a micro-void are calculated. It is found that the nucleation of micro-cracks is caused by the tensile stress at the voids＇ surface, and such damage nucleation will be speeded up by the remote uniaxial compressive load.

关 键 词：sulfate attack uniaxial compression micro-damage cement mortar Eshelby＇smethod 

分 类 号：TU528[建筑科学—建筑技术科学]